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Numerical modeling of hydrophysical fields of the Black Sea under the conditions of alternation of atmospheric circulation processes

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Abstract

The hydrological regime of the Black Sea in the conditions of permanent alternation of atmospheric circulation processes was investigated on the basis of a baroclinic prognostic model of the sea dynamics. In the model, variations in the wind action were expressed as permanent alternation of 24 wind types characteristic of the Black Sea basin throughout the year. Thermohaline impact of the atmosphere was taken into account by specifying the annual trends of temperature and salinity at the sea surface, which was established from multiyear means of these parameters. The problem was solved numerically on the basis of the method of two-cycle splitting with the use of the grid with a horizontal spacing of 5 km. Results of the numerical experiment showed that, under the influence of a strong nonstationarity of atmospheric processes, the water circulation in the upper layer of the Black Sea changes qualitatively and quantitatively. The upper 20–30-m layer of the sea is particularly sensitive to atmospheric circulation variations. For any character of atmospheric circulation, the Black Sea circulation below this layer is nearly always cyclonic with internal cyclonic rotations.

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Authors and Affiliations

  1. Institute of Geophysics, ul. M. Aleksidze 1, Tbilisi, 0193, Georgia

    A. A. Kordzadze, D. I. Demetrashvili & A. A. Surmava

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  1. A. A. Kordzadze
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  2. D. I. Demetrashvili
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  3. A. A. Surmava
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Correspondence to A. A. Kordzadze.

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Original Russian Text © A.A. Kordzadze, D.I. Demetrashvili, A.A. Surmava, 2008, published in Izvestiya AN. Fizika Atmosfery i Okeana, 2008, Vol. 44, No. 2, pp. 227–238.

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Kordzadze, A.A., Demetrashvili, D.I. & Surmava, A.A. Numerical modeling of hydrophysical fields of the Black Sea under the conditions of alternation of atmospheric circulation processes. Izv. Atmos. Ocean. Phys. 44, 213–224 (2008). https://doi.org/10.1134/S0001433808020096

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